Springing for upholstery



A. B IN 1,833,817

Nov. 24, 1931.

SPRINGING FOR UPHOLSTERY Filed May 28. 1929 nw'smoa Andreas Bing,

ATTORNEY Patented Nov. .24, 1931 UNITED s'r-Aras PATENT OFFICE T I ANDREAS nme, or wnsmoman, em

SPRINGTNG FDR UPHOLSTEBY Application filed Kay 28, 1929, Serial No. 866,598, and in Germany June 2, 1928.

This invention relates to a wire spring for cushion seats and aims to provide a construction which dispenses with the use of webbing and a form which is laterally undulated in such manner that it is shiftable' longitudinally on the chair frame. i

An object is to provide an exceedingly simple and inex enslve construction wherein the spring whic bears against the cushion is shlftable against'the variable friction of an end fastening orfastenings. This construction presents the advantage that during the bending of the spring with the cushion, its tension remains almost constant so that l5 the cushioning is much softer and an intermittent counter pressure cannot occur. Such a construction is also greatly simplified and inexpensive especially when" produced in quantities, since for fastening the spring carrying the cushion, merely a hinge is required at one end and an eye mounting is used at the other end. The invention is intended for use with all kinds of upholstery, primarily for chairs.

- By the use of the new springing not only the objections to the former upholstery are avoided but the use of webbing is rendered;

absolutely unnecessary.

The invention is illustrated by way of example in the accompanying drawings in which Fig. 1 shows a cross-section through the the tension of the spring 7, g has further inseat of a chair.

Fig. 2 is a top plan view of the spring 0.

In the drawings, I

a is the chair seat frame, I) the upholstery and c the spring which is secured at one end in a clamp or hinge d which is fastened to the seat frame by a number of staples. The other end of the spring is held by a clamp e. which is also fastened to the seat frame a.

As shown in Fig. 2 the spring is composed of spring bars f and g bent laterally in z1gzag shape and fastened in the'clamps d and e. Thespring bars 7 and g are held together by means of clamps it. Either two individual spring bars 7 and g or a continuous wire spring having its free ends inserted in the clamp a, may be used. One or both of the 0 clamps d and c has a slot 2', in which the spring a is capable of slight displacement. In order to prevent noisethis slot .z' may be provided I with a strip of leather. The spring in its normal posltion assumes the upwardly bowed shape shown in Fig. 1.- a

One feature of the invention resides in the fact that this novel form of spring rests throughout almost its whole length on the seat and is fully utilized for carrying the load, and thereby the pressure is uniformly 60 distributed, whereas with the ordinary cylindrical springs only single points are supported and with flat spiral springs only some of the springs carry the load. A further important advantage of the springs is the fact 66 that the arrangement of the springs in the desired manner, i. e. domed,'ensure s the good shape of the seat.

It will be noted that the eye e, in which the spiral spring 7, g or c, respectively, can 70' slide longitudinally is not situated in its normal position in the direction of the curvature of the spring, but is at an angle of about 20 creased and at the same time the inclination angle of the curvature of the spring f,.g or Q a relative to the direction of t e eye e has reduced, that is has become practically zero,

the one sided friction in the eye disappears and consequently the spring f, 9 can .then shift longitudinally.

By the construction described the tension of the spring will remain practically con-. stant during its entire bending and the cushioning will therefore be soft and neither a sudden sagging nor an intermittent counter pressure can occur.

An advantage of the s rings according to the invention is that t ey are extremely simple to make and secure and can be a vantageously packed. A point worthy of a 1,ass,-e17

- particular mention is the fact that the springs may be usediwithout any' accessories, that" is to say, without the use of'webbings, coverings or similar arrangements, so that l 6. their fitting'is extremely simple. Instead of the surrounding clamps ordinary .wi're clam s may-be used. The individual springs I may arrange d side by side either parallel 10 I cl or at an desired angle the one to "the other..

1. 'Azsp gior spring seats com rising an upwardly convex spring element a apted for supporting contact with a cushion, said spring beingj a wire generally of U-shape and 15 having lateral undulations, a mounting mom'- bergth e terminals of said wire being pivotally engage gin said' mounting member, a second mountinggrnember, said second mounting member having an elongated slot through I go which the wire passes, said elongated slot permitting longitudinal shifting of said wire when yielding of the undulations is insuificient to accommodate the load. 2. A spring according to claim 1' wherein 25 said springwire' is in a single piece.

3. spring according to claim 1 wherein I that portion of the wire passing throughthe v second mentionedmounting member is the v connecting member for the arms of the so spring, said connect ng, portion as it slides causing one spring arm to take up the longi- 1 tudinal load on the other spring arm. 7

4. A spring for spring seats comprising an upwardly convex spring element adapted for "all. supporting contact with a icushion, said spring belng generally endless and having I substantially parallel arms and first and second connectingportions, said arms having lateral undulations, mounting members hav- 4!! ing openingSm which said first and secondconnecting portions are pivoted, said mountingmembers being disposed in rigid relation, one of said mounting members havin its joppning: elongated to permit longitu inal s 'fti ng of said spring whenyielding of the P undulations is insufiicie'nt to accommodate w the load,- said portions being adapted for in-.

f crease of}? frictional f engagement with the mounting members under aload.-

. nnnms t m 1 v 

